Feature request: add a KiroCrew platform target/profile

What

Add KiroCrew (https://github.com/kirodotdev/KiroCrew) as a supported deploy target/profile in APM, so apm install <pkg> can place skills where KiroCrew reads them.

Why

APM detects and deploys to the platform directories it knows: .github/ (Copilot), .cursor/, .claude/, .opencode/, and for the Kiro family it writes skills to ~/.kiro/skills/ (global) or <project>/.kiro/skills/.

KiroCrew — an agent-management layer several teams run on top of Kiro — discovers skills from a different root: ~/.kiro/crew/skills/. So a package installed with APM today is invisible to KiroCrew's injected skill index. Users currently bridge the gap with per-skill symlinks from ~/.kiro/skills/* into ~/.kiro/crew/skills/*, which is a manual, drift-prone step.

Proposed behaviour

A kirocrew platform profile whose output path is the KiroCrew global skills directory:

• Detect KiroCrew by the presence of ~/.kiro/crew/ (analogous to detecting .claude/ for Claude Code).
• Deploy skill packages into ~/.kiro/crew/skills/<slug>/ (a directory-per-skill layout matching KiroCrew's existing convention).
• Support it as an explicit --target kirocrew value as well as auto-detection, matching how the other platforms behave.

Workaround that exists today (why this is a nicety, not a blocker)

KiroCrew added a skills.extra_paths config key that lets it load skills read-only from an additional directory. Pointing that at ~/.kiro/skills makes APM-installed skills load into KiroCrew with no symlinks. A first-class kirocrew target would remove even that config step and make the two tools symmetric.

Context

Raised from a Flutter-Global internal effort to make an APM marketplace the single source of truth for agent skills across both Kiro and KiroCrew.

Start at the platform detection and --target handling used by apm install <pkg>, then trace the existing Kiro profile and its global skill-directory deployment. Add the kirocrew profile for ~/.kiro/crew/skills/<slug>/, detect ~/.kiro/crew/, and support explicit targeting. Done means both auto-detection and --target kirocrew deploy packages to the requested directory.